Influence of CuO on Ce-Zr-O2 Dispersion on Catalytic Properties in CO Oxidation†

doi:10.7503/cjcu20150018

Abstract

Abstract:

Ce-Zr-O₂ solid solution was prepared by citric acid method and 10%M/Ce_0.8Zr_0.2O₂(M=Co, Mn, Cu) and 1%Pt/Ce_0.8Zr_0.2O₂ were prepared by incipient-wetness impregnation method. It was found that Cu was the best active composition in CO oxidation over M/Ce_0.8Zr_0.2O₂, which CO was completely converted into CO₂ at ca. 120 ℃ and was more active than 1%Pt/Ce_0.8Zr_0.2O₂. It was found that the optimum ratio of Ce to Zr was 4, Cu/Ce_0.8Zr_0.2O₂ showed the best activity in CO oxidation. Deposition method(DP), incipient-wetness precipitation method(IW), hydro-thermal method(HT) and citric acid method(CA) were used to prepare 20%Cu/Ce_0.8Zr_0.2O₂ catalysts. Cu/Ce_0.8Zr_0.2O₂ prepared by deposition method showed better activity in CO oxidation, which CO was completely converted into CO₂ at ca. 100 ℃. The data from H₂-TPR showed that the redox of Cu/Ce_0.8Zr_0.2O₂ was not a determining factor to control the CO oxidation. TEM results showed that the CuO was well dispersed on Ce_0.8Zr_0.2O₂. Based on adsorption data of CO and O₂, the high activity of Cu-based catalyst should be ascribed to the week competitive adsorption between CO and O₂ over Cu/Ce_0.8Zr_0.2O₂. The oxygen vacancy on Ce_0.8Zr_0.2O₂ was a crucial factor to affect the CuO dispersion and to reduce the competitive adsorption between CO and O₂.

Key words: Dispersion, CuO, Ce-Zr-O2 solid solution, Activity in CO oxidation, Oxygen vacancy

CLC Number:

O643.36⁺1

TrendMD:

KONG Lingzhi, WANG Qian, XU Li, YAN Yongsheng, LI Huaming, YANG Xiangguang. Influence of CuO on Ce-Zr-O₂ Dispersion on Catalytic Properties in CO Oxidation^†[J]. Chem. J. Chinese Universities, 2015, 36(7): 1372.

Figures/Tables 7

Fig.1 Catalytic activity over various M/Ce0.8Zr0.2O2 in CO oxidationa. 10%Cu/Ce0.8Zr0.2; b. 1%Pt/Ce0.8Zr0.2;c. 10%Co/Ce0.8Zr0.2; d. 10%Mn/Ce0.8Zr0.2;e. 10%Ni/Ce0.8Zr0.2.

Fig.2 Influence of molar ratio of Ce to Zr on catalytic activitya. 20%Cu/Ce0.8Zr0.2O2; b. 20%Cu/CeO2;c. 20%Cu/Ce0.5Zr0.5O2;d. 20%Cu/Ce0.2Zr0.8O2.

Fig.3 Influence of preparation methods on catalytic activitya. DP; b. CA; c. HT; d. IW.

Fig.4 XRD patterns of 20%Cu/Ce0.8Zr0.2O2 prepared by different methods(A) and enlarged view of diffraction peaks in a range of 25°—32°a. CA; b. HT; c. IW; d. DP.

Fig.5 H2-TPR curves of 20%Cu/Ce0.8Zr0.2O2 prepared by different methodsa. DP; b. HT; c. CA; d. IW; e. CeZr.

Fig.6 TEM images for various Cu/CeZr(A) DP; (B) HT; (C) CA; (D) IW; (E) CeZr.

Fig.7 Adsorption properties of CO and O2 over various Cu/CeZra. CA; b. IW; c. HT; d. DP.

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Influence of CuO on Ce-Zr-O₂ Dispersion on Catalytic Properties in CO Oxidation^†

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